6 is correct you have a device like pictured between GPS (gear position sensor) that tells the bike it is in always in 6 gear. Suzuki made it that bike only got full power in 6th gear as a precaution so anyone could ride the busa & think they had a powerful bike. The showing 5 in 5th & 6th is result of tricking the system into full power 1-6 gears.

6 is correct you have a device like pictured between GPS (gear position sensor) that tells the bike it is in always in 6 gear. Suzuki made it that bike only got full power in 6th gear as a precaution so anyone could ride the busa & think they had a powerful bike. The showing 5 in 5th & 6th is result of tricking the system into full power 1-6 gears.